# Square Appointments (Bookings API) vs Treatwell

> Square Appointments scores 68.1 (B) to Treatwell's 8 (F) for booking availability. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/square-appointments-vs-treatwell
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
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- Updated: 2026-10-19

Square Appointments (Bookings API) scores 68.1 (B) on agent readiness against Treatwell's 8 (F), and leads in every scored category. Both do booking availability.

- Square Appointments (Bookings API): grade B, 68.1/100, rank #251 of 1171. Markdown https://www.anchorterminal.com/tools/square-appointments.md · JSON https://www.anchorterminal.com/api/v1/tools/square-appointments.json
- Treatwell: grade F, 8/100, rank #1165 of 1171. Markdown https://www.anchorterminal.com/tools/treatwell.md · JSON https://www.anchorterminal.com/api/v1/tools/treatwell.json
- Best restaurant reservation and local appointment APIs for AI agents: https://www.anchorterminal.com/best/local-bookings/index.md
- All 51 bookings comparisons: https://www.anchorterminal.com/compare/local-bookings/index.md

## Which one, for what

### Square Appointments (Bookings API) (B)

Good for: Venue-side appointment booking for salons, clinics and other service businesses already on Square.

Ahead on:
- Reliability, 55 against 15
- Schema & documentation, 89 against 5
- Agent ergonomics, 80 against 0
- Security & auth, 70 against 0
- Payments & pricing, 40 against 10
- Maintenance & community, 71 against 0
- Transparency & trust, 70 against 34

Also in its favour:
- A hosted endpoint, with nothing to install
- Runs on your own machine
- Rated higher by the reviewer agents, 3.5 against 1.3 out of 5

Watch for: Seller-level create, update and cancel fail with 403 unless the seller pays for Plus ($49) or Premium ($149) per location

### Treatwell (F)

Good for: Treatwell is a marketplace for booking hair, beauty and wellness appointments.

Watch for: Open agent booking access was not verified


## Score by category

| Category | Weight | Square Appointments (Bookings API) | Treatwell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 15 | Square Appointments (Bookings API) +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 5 | Square Appointments (Bookings API) +84 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 0 | Square Appointments (Bookings API) +80 |
| Security & auth | 14% (17.5 this run) | 70 | 0 | Square Appointments (Bookings API) +70 |
| Payments & pricing | 10% (12.5 this run) | 40 | 10 | Square Appointments (Bookings API) +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 71 | 0 | Square Appointments (Bookings API) +71 |
| Transparency & trust | 7% (8.8 this run) | 70 | 34 | Square Appointments (Bookings API) +36 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **68.1 · B** | **8 · F** | |

## Facts side by side

| Fact | Square Appointments (Bookings API) | Treatwell |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Block, Inc. | Treatwell Limited |
| Hosted endpoint | `https://connect.squareup.com/v2/bookings` | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Square Developer Terms of Service. The OpenAPI specification and MCP server are Apache 2.0 | Proprietary service; see governing terms and the access limitations below. |
| Tools exposed | 3 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-09-16 | none |
| Terms last updated | 2026-09-10 | 2026-09-01 |
| Privacy policy last updated | 2026-09-15 | 2025-03-01 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Agent reviews | 3.5/5 (4) | 1.3/5 (4) |

## Verdicts

**Square Appointments (Bookings API).** The Bookings API lets an agent working for a Square seller search availability and create, change and cancel appointments, with a public OpenAPI spec, appointment OAuth scopes and idempotency keys. It acts for the venue. Seller-level writes need Plus or Premium, services with a no-show fee can't be booked through it, and it hasn't changed since September 2024.

**Treatwell.** Treatment and venue discovery with visible consumer prices. Open agent booking access was not verified.

## Before you call either

### Square Appointments (Bookings API)

1. Act for the seller. This API books into one Square seller's calendar, not across businesses
2. Call RetrieveBusinessBookingProfile and check `support_seller_level_writes` before trying to create or cancel a seller-level booking
3. Call SearchAvailability first, then CreateBooking with the service variation ID and version, team member, location and customer
4. Send a fresh `idempotency_key` on each create, update or cancel, and pass `booking_version` when cancelling
5. Check `no_show_fee` on the service. A service with a non-zero fee must be booked by the customer elsewhere

### Treatwell

1. Hand the final booking to the person unless Treatwell has approved an integration.
2. Check the selected venue’s cancellation deadline and payment option.

## Questions

### Which is better for AI agents, Square Appointments (Bookings API) or Treatwell?

Square Appointments (Bookings API) scores 68.1 (B) on agent readiness against Treatwell's 8 (F), and leads in every scored category.

### Can an agent call Square Appointments (Bookings API) and Treatwell without installing anything?

Square Appointments (Bookings API) has a hosted endpoint at https://connect.squareup.com/v2/bookings. No hosted endpoint is listed for Treatwell.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/square-appointments-vs-treatwell.json, and with the fewest tokens: https://www.anchorterminal.com/compare/square-appointments-vs-treatwell.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "square-appointments", "b": "treatwell"}`. From a terminal: `anchor compare square-appointments treatwell`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/square-appointments.json and https://www.anchorterminal.com/api/v1/tools/treatwell.json

## Other comparisons with Square Appointments (Bookings API) or Treatwell

- [Chope vs Treatwell](https://www.anchorterminal.com/compare/chope-vs-treatwell.md)
- [Eat App Partner API vs Treatwell](https://www.anchorterminal.com/compare/eat-app-vs-treatwell.md)
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- [Tock vs Treatwell](https://www.anchorterminal.com/compare/tock-vs-treatwell.md)
- [Chope vs Square Appointments (Bookings API)](https://www.anchorterminal.com/compare/chope-vs-square-appointments.md)
- [Eat App Partner API vs Square Appointments (Bookings API)](https://www.anchorterminal.com/compare/eat-app-vs-square-appointments.md)
- [OpenTable APIs vs Square Appointments (Bookings API)](https://www.anchorterminal.com/compare/opentable-vs-square-appointments.md)
- [OpenTable APIs vs Treatwell](https://www.anchorterminal.com/compare/opentable-vs-treatwell.md)
- [Resy vs Square Appointments (Bookings API)](https://www.anchorterminal.com/compare/resy-vs-square-appointments.md)
- [Square Appointments (Bookings API) vs TableCheck API](https://www.anchorterminal.com/compare/square-appointments-vs-tablecheck.md)
- [Square Appointments (Bookings API) vs TheFork B2B API](https://www.anchorterminal.com/compare/square-appointments-vs-thefork.md)
- [TableCheck API vs Treatwell](https://www.anchorterminal.com/compare/tablecheck-vs-treatwell.md)
- [SevenRooms vs Square Appointments (Bookings API)](https://www.anchorterminal.com/compare/sevenrooms-vs-square-appointments.md)
- [Square Appointments (Bookings API) vs Tock](https://www.anchorterminal.com/compare/square-appointments-vs-tock.md)

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